Fuel pump valve for diesel engines



April! 30, E935. H. D. HILL.

FUEL PUMPvVALVE FOR DIESEIIJ ENGINES Filed Mgy 25, 1931 M #JI INVEN-roR Igan? /Zdl EY MM (1&4.

ATTORNEYS Patented Apr. l 30, 1935 vFUEL PUMP VALVE FOR DIESEL ENGDIES Harry D. Hill, Lansing, Mich., assigner to Hill- Diesel Engine Company, Lansing, Mich., a corporation of Michigan Application May 25, 1931, Serial No. 539,896

1 Claim. (CIL 251-121) Nthrough which the pumped liquid fuel is ejected to pass to the engine.

5 valves have been employed for this purpose but it has been found that frequently such valves will fail to hold the pressure due to the lodging of sediment upon some portion of the valve seat.

Furthermore, in the operation of such a valve the ball is but slightly lifted from its seat so that any obstruction lodging on the seat may be retained in this position. It is therefore, the object of the present invention to -obtain a valve which ls free from such defects and to this end the invention consists inthe construction as hereinafter set forth.

In the drawing:

Figure l is a longitudinal section through a fuel pump for Diesel engines provided with my improved valve;` Y

Figure 2 is an enlarged section through the valve.

The pump for the fuel may be of any suitable construction, but as show-n A is the pump barrel, B a plunger movable in said barrel, C a cam for actuating the plunger, D the inletport of the barrel and E the outlet port therefor.. The outlet port E is formed in the valve seat member F L which is provided with the usual conical annular seat Gfor the ball H. The member F 'is further provided with an outward extension which has a cylindrical portion I thatis of a diameter closely tting the diameter of the ball with only sumcient clearance to insure freedom' of movement of the latter. This cylindrical portion extends above the seat a distance beyond the center of the ball and between the cylindrical portion of the seat there is an enlarged annular recess J. K is a coil spring of a diameter less than the diameter of the ball, onel end of said spring bearing upon the ball and the opposite end against an abutment in a member L which is recessed to receive the spring. A pin member M serves to guide theq spring and this mem-'- ber is hollow and provided with alateral port With the construction as the plunger B is actuated in STATES PATE- OFFICE described, whenever an upward direction it will first close the inlet port D and then displace the uid in the barrel above this port. 'Ihe fluid thus displaced will lift the ball H from its seat but by reason of the fact that the ball quite closely ts the cylindrical port I of the member F there is no escape for the fluid until the ball is moved further upward. This will withdraw the ball suiciently from its seat so that any sediment that may have lodged thereon will probably be displaced by the ow of fluid. Upon the reverse stroke of the plunger the lifting pressure is.

relieved whereupon the spring K will return the ball to its seat. The distance traveled by the ball in reseating is sufiicient to impart considerable velocity so that the blow of the ball upon the seat will disintegrate any substance that may still be lodged thereon. Also the annular recess J which extends above the seat to near the equator of the ball in seated position,A provides a sediment chamber and full hydrostatic pressure on the complete hemisphere of the ball 'when the latter rises from its seat. 1

My improved construction can be manufactured at low cost for a commercial ball such as used for ball bearings can be employed for the valve and the cylindrical bearing surrounding the ball may be formed simultaneously with the forming ofthe valve seat.

of the ball when seated, said cylindrical portion closely fittingv said ball, said seat member having an annular recess between the seat portion and said cylindrical portion and the upper end of said cylinder being in a plane perpendicular to the direction of rise of the ball.

HARRY D. 

